package com.nowcoder.community.entity;

/**
 * <p>Title: Page</p>
 * <p>author 12427</p>
 *
 * @version ver1.0
 * @date 2022/7/3 11:21
 */

/**
 * 封装分页相关信息
 */
public class Page {

    // 当前页码
    private int current = 1 ;

    // 显示上限
    private int limit = 10 ;

    // 数据条目总数(用于计算总的页数)
    private int rows ;

    // 查询路径(用来复用分页的链接)
    private String path ;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current >= 1) {
            this.current = current;
        }
    }

    /**
     * 获取每页的显示限制
     * @return
     */
    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit >=1 && limit <= 100){
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if(rows>=0){
            this.rows = rows;
        }

    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    /**
     * 获取当前页的起始行
     * @return
     */
    public int getOffset(){
        return limit * (current-1) ;
    }

    /**
     * 获取总的页数
     */
    public int getTotal(){
        if(rows % limit == 0 ) {
            return rows / limit ;
        }else {
            return rows / limit +1 ;
        }
    }


    /**
     * 获取显示的起始页码
     * @return
     */
    public int getFrom(){
        int from = current -2 ;
        return from < 1 ? 1 : from ;
    }
    /**
     * 获取显示的结束页码
     * @return
     */
    public int getTo(){
        int to = current + 2 ;
        int tot = getTotal() ;
        return to > tot ? tot : to ;
    }

}
